ISO 18487-1:2017

INTERNATIONAL ISO
STANDARD 18487-1
First edition
2017-04
Aerospace series — Titanium tube for
35 MPa operating pressure —
Part 1:
Inch series
Série aérospatiale — Tubes en titane — Pression de service : 35 MPa —
Partie 1: Série en inches
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Dimensions . 2
5 Tolerances . 3
6 Technical requirements . 3
6.1 General . 3
6.2 Composition . 3
6.3 Melting practice . 3
6.4 Heat treatment and delivery condition . 3
6.5 Tensile properties . 3
6.6 Microstructure . 4
6.6.1 General. 4
6.6.2 Grain size . 4
6.6.3 Contractile strain ratio (CSR) . 4
6.7 Surface condition and texture . 4
6.7.1 Surface treatment. 4
6.7.2 Surface condition . 4
6.7.3 Surface texture, R .
a 5
6.8 Ultrasonic inspection . 5
6.9 Flarability . 5
6.9.1 General. 5
6.9.2 Surface contamination . 5
6.10 Bending . 7
6.11 Flattening . 7
6.12 Deformation under pressure test . 7
6.13 Impulse pressure fatigue test . 8
6.13.1 General. 8
6.13.2 Proof test. 8
6.13.3 Pressure impulse test . 8
6.13.4 Additional test .11
6.13.5 Ultimate (as per CS 25.1435) and burst test.11
7 Quality assurance .12
8 Preparation for delivery .12
8.1 Marking .12
8.2 Packing .12
Bibliography .13
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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URL: w w w . i s o .org/ iso/ foreword .html
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 10, Aerospace fluid systems and components.
A list of all the parts in the ISO 18487 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

Introduction
This document is intended to harmonize the technical requirements for titanium tubes used in
aerospace with design operating pressure of 35 MPa.
It is noted that, while ISO standards should normally refer only to SI units, large segments of the
aerospace industry refer to other measurement systems as a matter of common working practice. The
mention of “inch series” in the title of this document reflects this. It recognizes the fact that the nominal
sizes referred to in the document, which are in common use in the aerospace industry, were originally
defined in terms of fractional inches.
Although the tube sizes were originally defined, and are frequently referred to, in terms of non-SI units,
all dimensions used in this document are in SI units with inch units given in addition for the convenience
of those users more familiar with these.
It is further noted that the standard ISO decimal symbol “,” (comma) is not used as common working
practice for inch dimensions. A decimal point is used in the inch dimensions in this document as in
many other aerospace standards.
NOTE The use of non-SI units and the decimal point in this document does not constitute general acceptance
of measurement systems other than SI within International Standards.
INTERNATIONAL STANDARD ISO 18487-1:2017(E)
Aerospace series — Titanium tube for 35 MPa operating
pressure —
Part 1:
Inch series
1 Scope
This document is applicable to seamless tubing of circular cross-section made from titanium alloy and
intended for use primarily in systems with system operating pressure of 35 MPa (5 080 psi) (Pressure
Class J), but usage is not limited to such applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions
and surface texture parameters
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 8492, Metallic materials — Tube — Flattening test
ISO 8575:2016, Aerospace — Fluid systems — Hydraulic system tubing
ISO 10583, Aerospace fluid systems — Test methods for tube/fitting assemblies
ISO 12573, Aircraft — Tubing tolerances — Inch series
EN 2003-010, Aerospace series — Titanium and titanium alloys — Test methods — Part 010: Sampling for
determination of hydrogen content
EN 3718, Aerospace series — Test method for metallic materials — Ultrasonic inspection of tubes
AS 4076, Contractile strain ratio testing of titanium hydraulic tubing
AMS 2634, Ultrasonic inspection, thin wall metal tubing superseding
ASTM E112, Standard test methods for determining average grain size
ASTM E1409, Standard test method for determination of oxygen and nitrogen in titanium and titanium
alloys by inert gas fusion
ASTM E1941, Standard test method for determination of carbon in refractory and reactive metals and their
alloys by combustion analysis
ASTM E1447, Standard test method for determination of hydrogen in titanium and titanium alloys by the
inert gas fusion thermal conductivity/infrared detection method
ASTM E2371, Standard test method for analysis of titanium and titanium alloys by direct current plasma
and inductively coupled plasma atomic emission spectrometry (Performance-based test methodology)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electroped
...